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Railways Sample Paper RRB (Assistant Loco Pilot) Sample Test Paper-19

  • question_answer
    The average weight of 45 students in a class is 52 kg. 5 of them whose average weight is 48 kg leave the class and other 5 students whose average weight is 54 kg join the class. What is the new average weight (in kg) of the class?

    A)  \[52.6\]               

    B)         \[52\frac{2}{3}\]                   

    C)  \[52\frac{1}{3}\]              

    D)         None of these             

    Correct Answer: B

    Solution :

    Total weight of 45 students \[=45\times 52=2340\text{ }kg\] Total weight of 5 students who leave \[=5\times 48=240\text{ }kg\] Total weight of 5 students who join \[=5\times 54=270\text{ }kg\] Therefore, new total weight of 45 students \[=2340-240+270=2370\] \[\Rightarrow \]New average weight \[=\frac{2370}{45}=52\frac{2}{3}kg\]


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